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I have a 4kw balboa heater on my hot tub. Can I replace just the element or do I have to replace the entire silver tube? Thanks for any help.

I have a balboa 4kw heater thats 15" x 2" x 2" on a cal spa. I haven't taken the heater tube off yet so i don't know if i can replace just the element or if i have to replace whole tube. Any help...